Log Message:
-----------
Add note that autovacuum can use up several times maintenance_work_mem,
with warning against setting it too high.
Modified Files:
--------------
pgsql/doc/src/sgml:
config.sgml (r1.198 -> r1.199)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml?r1=1.198&r2=1.199)